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Another vote for X-stream if you want to do cave tubing. Don' t do it if you don't like being outdoors for a long time or hanging out with bats. My wife is a non-swimmer and our guide stayed close to her and she survived. The ship's tours are more expensive and too many in the group. There will be a smaller group that have signed up with X-Stream from your ship and the guides will make sure and get you back in time. Carnival took our picture and we weren't even with the ship's tour. The guides cut fresh pineapple that morning to give you after the tour that melts in your mouth.